The Iraq War created a new set of sectarian politics in the country. The transformation amongst Sunnis was a perfect example. Before they did not have a real sense of themselves as a group, but after 2003 they felt threatened by the Shiite parties that they conflated with Iran, and that helped create a new communal identity. Two authors Fanar Haddad and Harith Hassan al-Qarawee have tried to explain these transformations. Their ideas along with statements by sheikhs, religious men, and soldiers from Anbar show how sectarianism did not emerge from centuries long conflict, but was rather created by the social and political situation in Iraq after the invasion.

continued (http://musingsoniraq.blogspot.com/2013/12/sunni-identity-politics-in-iraq-after.html)